Read more about the condition New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is applicable). Although Johan Wolfgang von Goethe is sometimes credited with its invention, one was found in his bedroom after his death, there is evidence that the Moors used similar instruments during the 8th century.

This desk instrument combines centuries-old principles to provide meteorological information at a glance: Galileo Galilei’s discovery that the relative density of liquids varies according to temperature provides the basis for the thermometer of floating glass globes; and Admiral Robert Fitzroy’s observations aboard HMS Beagle (during Charles Darwin’s famous voyage) allows weather changes to be predicted with the appearance of streaks, cloudiness, flakes and crystals in a special combination of liquids known as the ‘Storm Glass’. The temperature surrounding the thermometer will make the liquid in the thermometer more dense as it cools, or less dense as it heats up. The blue and yellow bubbles (60 and 65 degrees, respectively) are calibrated so that they have higher densities than the water at this temperature, so they sink.This can fade the color of the spheres inside the tube, affecting its temperature measuring accuracy. IMPORTANT INFORMATION ABOUT THIS PRODUCT: Your sealed Galileo thermometer is filled with a common mineral-based, ozone friendly solvent (paraffin oil) to prevent bacterial growth. These glass galileo thermometer with barometer can be placed where it is needed, to monitor the temperature of the weather, water, or other areas.

If you have read this question, then you know that an object immersed in a fluid experiences two major forces: the downward pull of gravity and the upward push of buoyancy. The thermometer measures every 4º degrees from 64º F to 80º F and is accurate to within 2º degrees with five floats.The spheres also contain liquid, but it changes density much less rapidly than the clear liquid in the thermometer, so it isn’t affected by the temperature change. It is named after Galileo Galilei because he discovered the principle on which this thermometer is based—that the density of a liquid changes in proportion to its temperature.